SSOT v3.7 · Contractor Detail Drawing · Acoustic Design Basis

Acoustic Door Details

Fabrication and installation cross-sections for D1–D4. All seals, rebates, and drop-seal thresholds shown for site coordination. Threshold and perimeter sealing items are acoustically critical [AC].

Door Set
D1–D4
Widths
80 / 90 cm
STC Range
45–50
Critical Items
Seals + thresholds [AC]

D1 — Entry Door

STC 50 · 90 × 220 cm

High-mass entry leaf with 50 mm solid-core timber, 12 mm mass-loaded vinyl both faces, heavy-duty hinges, neoprene compression seals, concealed closer, and Pemko 411 automatic drop seal at the threshold [AC].

ComponentSpecification
Leaf core50 mm solid core timber
Face build-up12 mm MLV each face
Perimeter sealNeoprene compression gasket at head + jambs [AC]
ThresholdPemko 411 automatic drop seal [AC]
Hardware3 acoustic hinges, 100 kg rated + concealed closer
D1 is the highest-isolation leaf in the project and must be shimmed square before seal compression is adjusted. The closer must pull the leaf fully into the perimeter gasket without bounce-back.

Horizontal Cross-Section

Top view through closed leaf and frame, with leaf build-up shown to scale.

90 cm nominal opening 50 mm solid-core timber leaf 12 mm MLV 12 mm MLV Steel frame jamb Steel frame jamb Compression gasket [AC] Leaf thickness at section: 74 mm overall (50 mm timber + 12 mm MLV each face) 220 cm leaf height

Threshold Detail

Side view of drop-seal threshold and finished floor interface.

[AC] Concealed closer zone Pemko 411 automatic drop seal Finished floor Concrete slab / structure 50 mm leaf core Clear threshold line

Frame Rebate Detail

Corner cross-section showing head rebate, seal pocket, and face build-up.

[AC] 12 mm MLV faces Neoprene compression seal pocket 74 mm door build-up 15 mm frame stop

D2 — Control Room Door

STC 45 · 90 × 220 cm

Interior acoustic leaf for the Control Room airlock. Assembly uses 45 mm solid core timber, 6 mm MLV both faces, steel lock-zone reinforcement, compression seal perimeter, and acoustic mortise lock.

Horizontal Cross-Section

Top view with lock reinforcement and perimeter compression seal.

90 cm door width 45 mm solid-core timber 6 mm MLV 6 mm MLV Steel lock reinforcement plate Compression seal perimeter [AC]

Threshold Detail

Control room side threshold with drop-seal contact line and acoustic lock side.

[AC] Automatic drop seal Acoustic mortise lock zone

Frame Rebate Detail

Corner section with compression seal pocket and timber / MLV leaf edge.

Compression gasket seat [AC] 6 mm MLV face layers

D3 — VO Live Door

STC 45 · 80 × 220 cm

Same acoustic build-up as D2 with reduced 80 cm leaf width for the VO Live partition opening.

ParameterValue
Leaf size80 × 220 cm
Core45 mm solid core timber
Faces6 mm MLV both faces
Lock zoneSteel reinforcement plate
SealsCompression perimeter + automatic threshold seal [AC]
Because D3 is narrower, closer force must be tuned carefully so the leaf does not rebound off the compression seal. Do not substitute a standard residential latchset.

Horizontal Cross-Section

Reduced-width leaf using the D2 material stack.

80 cm clear leaf width D2 build-up repeated at narrower opening

Threshold Detail

Drop seal and floor interface identical to D2.

[AC] Automatic threshold seal

Frame Rebate Detail

Seal pocket and lock-zone reinforcement coordination at head/jamb corner.

Compression seal zone [AC] Steel reinforcement aligns with lock stile

D4 — Studio Door

STC 48 UPGRADED · 90 × 220 cm

Upgraded leaf between Studio and Editing. Double MLV stack, 15 mm rebated frame, 3-point locking bar, and compression seals on all four edges. This is the highest-performing interior door in the project [AC].

Horizontal Cross-Section

Leaf stack with 12 mm + 6 mm MLV both faces and rebated frame interface.

90 cm leaf width 50 mm solid core timber 12 + 6 mm MLV 12 + 6 mm MLV 3-point locking bar zone

Threshold Detail

Four-edge compression seal condition with drop seal aligned to Studio/Editing threshold.

[AC] Compression seal all 4 edges [AC] Drop seal line 50 mm core + 36 mm MLV

Frame Rebate Detail

15 mm rebated frame profile with seal line and lock-bar engagement pocket.

15 mm rebate depth 3-point lock receiver Compression seal pocket [AC]

Site Notes

  • Shim all frames plumb and square before gasket adjustment. Seal compression is only valid after final alignment.
  • Do not bridge thresholds with flooring adhesive or skirting. Keep the automatic drop-seal travel path clean [AC].
  • Lock hardware reinforcement plates must be concealed within the leaf build-up and must not short-circuit the perimeter seal line.
  • D4 rebated frame and lock-bar receivers must be coordinated before gypsum closure on Wall 7.